Centos8 Server Failing, keeps crashing and not responding.

[error] 998#0: *16014 connect() to unix:/run/php-fpm/www.sock failed (11: Resource temporarily unavailable) while connecting to upstream

System: Centos 8
Php version: PHP 8.1.2 (cli) (built: Jan 18 2022 23:52:03) (NTS gcc x86_64)

I am running very light resource application with concurring requests, My server keeps crashing every few hours with the following message in nginx error.log file:

[error] 998#0: *16014 connect() to unix:/run/php-fpm/www.sock failed (11: Resource temporarily unavailable) while connecting to upstream…